Methods and systems for restoring data from a target device are described. According to some embodiments, the method receives a first set of data packets for restore, where the first set of data packets includes a multiplicity of data chunks. The method further captures footprints of the first set of data packets in a cache disk array. In response to receiving an acknowledgement from the cache disk array indicating the footprints of the first set of data packets have been captured, the method pushes each data chunk of the first set of data packets to a construction container for reconstruction of backup data. In response to receiving an acknowledgement from the construction container indicating the data chunk is successfully pushed, the method flushes the respective footprint of the data chunk from the cache disk array.
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1. A computer-implemented method for restoring data from a target device onto a source device by a restore agent on a storage system, comprising:
using cache availability on the source device to emulate a cache disk array to be utilized by the restore agent;
receiving, by a read latch, a first set of data packets from the target device for restore, wherein the first set of data packets comprises a plurality of data chunks;
capturing footprints of the first set of data packets in the cache disk array; and
in response to receiving an acknowledgement from the cache disk array indicating that the footprints of the first set of data packets have been captured:
pushing each data chunk of the first set of data packets to a construction container on the storage system for reconstruction of backup data;
in response to receiving an acknowledgement from the construction container indicating the data chunk is successfully pushed, flushing a footprint of the data chunk from the cache disk array; and
in response to receiving an unexpected abort signal from the read latch indicating a read operation is aborted, sending a freeze signal from the restore agent to the cache disk array thereby freezing the cache disk array at a point in time where a last data chunk was successfully pushed to the construction container.
8. A non-transitory machine-readable medium having instructions stored therein, which when executed by a processor, cause the processor to perform operations for, the operations comprising:
using a restore agent on a storage system to determine cache availability on a source device and emulating a cache disk array on the source device to be utilized by the restore agent;
receiving, by a read latch, a first set of data packets from a target device for restore, wherein the first set of data packets comprises a plurality of data chunks;
capturing footprints of the first set of data packets in the cache disk array; and
in response to receiving an acknowledgement from the cache disk array indicating that the footprints of the first set of data packets have been captured:
pushing each data chunk of the first set of data packets to a construction container on the storage system for reconstruction of backup data;
in response to receiving an acknowledgement from the construction container indicating the data chunk is successfully pushed, flushing a footprint of the data chunk from the cache disk array; and
in response to receiving an unexpected abort signal from the read latch indicating a read operation is aborted, sending a freeze signal from the restore agent to the cache disk array thereby freezing the cache disk array at a point in time where a last data chunk was successfully pushed to the construction container.
15. A data processing system, comprising:
a processor; and
a memory coupled to the processor to store instructions, which when executed by the processor, cause the processor to perform operations, the operations comprising:
executing a restore agent on a storage system;
using the restore agent to determine cache availability on a source device and emulating a cache disk array on the source device to be utilized by the restore agent;
receiving, by a read latch, a first set of data packets from a target device for restore, wherein the first set of data packets comprises a plurality of data chunks;
capturing footprints of the first set of data packets in the cache disk array; and
in response to receiving an acknowledgement from the cache disk array indicating that the footprints of the first set of data packets have been captured:
pushing each data chunk of the first set of data packets to a construction container on the storage system for reconstruction of backup data;
in response to receiving an acknowledgement from the construction container indicating the data chunk is successfully pushed, flushing a footprint of the data chunk from the cache disk array; and
in response to receiving an unexpected abort signal from the read latch indicating a read operation is aborted, sending a freeze signal from the restore agent to the cache disk array thereby freezing the cache disk array at a point in time where a last data chunk was successfully pushed to the construction container.
2. The method of
querying remaining footprints of the first set of data packets from the cache disk array, and
identifying the last data chunk that was successfully pushed to the construction container based on the queried footprints.
3. The method of
performing a health check of container data in the construction container,
if recent data chunks from the container data are insufficient to be reconstructed, re-querying the recent data chunks from the target device as a starting point for the next restore,
otherwise if the recent data chunks are sufficient to reconstruct, using the identified last data chunk as the starting point.
5. The method of
6. The method of
7. The method of
indicating the read latch to hold a second set of data packets at the read latch.
9. The non-transitory machine-readable medium of
querying remaining footprints of the first set of data packets from the cache disk array, and
identifying the last data chunk that was successfully pushed to the construction container based on the queried footprints.
10. The non-transitory machine-readable medium of
performing a health check of container data in the construction container,
if recent data chunks from the container data are insufficient to be reconstructed, re-querying the recent data chunks from the target device as a starting point for the next restore,
otherwise if the recent data chunks are sufficient to reconstruct, using the identified last data chunk as the starting point.
11. The non-transitory machine-readable medium of
12. The non-transitory machine-readable medium of
13. The non-transitory machine-readable medium of
14. The non-transitory machine-readable medium of
16. The data processing system of
querying remaining footprints of the first set of data packets from the cache disk array, and
identifying the last data chunk that was successfully pushed to the construction container based on the queried footprints.
17. The data processing system of
performing a health check of container data in the construction container,
if recent data chunks from the container data are insufficient to be reconstructed, re-querying the recent data chunks from the target device as a starting point for the next restore,
otherwise if the recent data chunks are sufficient to reconstruct, using the identified last data chunk as the starting point.
18. The data processing system of
19. The data processing system of
20. The data processing system of
21. The data processing system of
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This application is related to co-pending U.S. patent application Ser. No. 16/453,568, entitled “Stream Level Uninterrupted Backup Operation Using Data Probe,” filed Jun. 26, 2019, the disclosure of which is incorporated by reference herein in its entirety.
Embodiments of the present invention relate generally to data storage systems. More particularly, embodiments of the invention relate to stream level uninterrupted backup operation using a data probe approach.
Unexpected events can cause backup and/or restore operations to abort prior to the completion of such operations. The need to start successive backups (or restores) from the point of interruption to avoid an increase in backup or restore window has become vital nowadays. While the backup or restore operation is in progress and due to some random unintended event, the operation would abruptly abort, thereby causing data to be partially written (e.g., half written) back to the target device or host. Also, the backup or restore would be rolled back after this point in most of the cases resulting in unusable data and potentially corrupted production environment. Such situation would lead to an increase of backup or restore window. Additionally, other pain point is that the backup or restore must be restarted again from the beginning, even though there are some portions of backup or restore data that have been completed.
Apparently, the backup admin would need a backup application that provides a service-level agreement (SLA) of achieving any successive backup or restore from an improper or random or unintended abort to be continuous in nature. The aim of a backup admin during such scenarios would be to have the successive backup or restore to be started from the point of abort, without the necessity of having to restart from the beginning, and to avoid any further increase in the backup or restore window.
Embodiments of the invention are illustrated by way of example and not limitation in the figures of the accompanying drawings in which like references indicate similar elements.
Various embodiments and aspects of the inventions will be described with reference to details discussed below, and the accompanying drawings will illustrate the various embodiments. The following description and drawings are illustrative of the invention and are not to be construed as limiting the invention. Numerous specific details are described to provide a thorough understanding of various embodiments of the present invention. However, in certain instances, well-known or conventional details are not described in order to provide a concise discussion of embodiments of the present inventions.
Reference in the specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in conjunction with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase “in one embodiment” in various places in the specification do not necessarily all refer to the same embodiment.
Embodiments of the invention disclose how the data probe approach has been used to identify the abrupt abort during a backup operation, and ensure a safe uninterrupted backup from the aborted point in the next backup session. In one embodiment, a cache disk array is used to hold marginal footprints of the data to be write-latched for the backup operation at any instance of time. Backup agent may utilize these footprints after an aborted backup to understand the current set of data packets that has to be consumed for the immediate write operation resulting in an uninterrupted backup session.
Embodiments of the invention further disclose a solution to avoid an increase in the backup window due to an unexpected abort. The solution ensures an uninterrupted backup service after an unintended termination of the backup session.
Embodiments of the invention further disclose how the data probe approach has been used to identify the abrupt abort during a restore operation and ensure a safe uninterrupted restore from the aborted point in the next restore session. In one embodiment, a cache disk array is used to hold marginal footprints of the data to be constructed for the restore operation at any instant of time. Restore agent may utilize these footprints after an aborted restore to understand the current set of data packets that has to be consumed for the immediate read operation resulting in an uninterrupted restore session.
Embodiments of the invention further disclose a solution to avoid an increase in the restore window due to an unexpected abort. The solution also ensures an uninterrupted restore service after an unintended termination of the restore session to prevent a corrupted production data.
According to some embodiments, a method for backing up data to a target device is described. The method receives a first set of data packets for backup, where the first set of data packets includes a multiplicity of data chunks. The method further captures footprints of the first set of data packets in a cache disk array. In response to receiving an acknowledgement from the cache disk array indicating the footprints have been captured, the method further initiates a write operation to write each data chunk of the first set of data packets to the target device. In response to receiving an acknowledgement indicating the data chunk is successfully written, the method further flushes the respective footprint of the data chunk from the cache disk array.
According to another embodiment, a method for restoring data from a target device is described. The method receives a first set of data packets for restore, where the first set of data packets includes a multiplicity of data chunks. The method further captures footprints of the first set of data packets in a cache disk array. In response to receiving an acknowledgement from the cache disk array indicating the footprints of the first set of data packets have been captured, the method pushes each data chunk of the first set of data packets to a construction container for reconstruction of backup data. In response to receiving an acknowledgement from the construction container indicating the data chunk is successfully pushed, the method flushes the respective footprint of the data chunk from the cache disk array.
Storage system 104 may include or represent any type of servers or a cluster of one or more servers (e.g., cloud servers). For example, storage system 104 may be a storage server used for various different purposes, such as to provide multiple users or client systems with access to shared data and/or to back up (or restore) data (e.g., mission critical data). Storage system 104 may provide storage services to clients or users via a variety of access interfaces and/or protocols such as file-based access protocols and block-based access protocols. The file-based access protocols may include the network file system (NFS) protocol, common Internet file system (CIFS) protocol, and direct access file system protocol, etc. The block-based access protocols may include the small computer system interface (SCSI) protocols, Internet SCSI or iSCSI, and Fibre channel (FC) protocol, etc. Storage system 104 may further provide storage services via an object-based protocol and Hadoop distributed file system (HDFS) protocol.
In one embodiment, storage system 104 includes, but is not limited to, storage service engine 106 (also referred to as service logic, service module, or service unit, which may be implemented in software, hardware, or a combination thereof), optional deduplication logic 107, and one or more storage units or devices 108-109 communicatively coupled to each other. Storage service engine 106 may represent any storage service related components configured or adapted to provide storage services (e.g., storage as a service) to a variety of clients using any of the access protocols set forth above. For example, storage service engine 106 may include backup logic 121 and restore logic 122. Backup logic or agent 121 is configured to receive and back up data from a client (e.g., clients 101-102) and to store the backup data in any one or more of storage units 108-109. In one embodiment, the backup data may be loaded into write latch 125, and write latch 125 is configured to write the backup data to a target device (e.g., storage units 108-109). Restore logic or agent 122 is configured to retrieve and restore backup data from any one or more of storage units 108-109 back to a client (e.g., clients 101-102). In one embodiment, to restore the backup data, read latch 126 may read the data from a target device (e.g., storage units 108-109), where the data is loaded into read latch 126. In one embodiment, cache disk array 151 is an emulated disk array carved out from a source under backup and/or restore host. In
Storage units 108-109 may be implemented locally (e.g., single node operating environment) or remotely (e.g., multi-node operating environment) via interconnect 120, which may be a bus and/or a network (e.g., a storage network or a network similar to network 103). Storage units 108-109 may include a single storage device such as a hard disk, a tape drive, a semiconductor memory, multiple storage devices such as a redundant array system (e.g., a redundant array of independent disks (RAID)), a system for storage such as a library system or network attached storage system, or any other appropriate storage device or system. Some of storage units 108-109 may be located locally or remotely accessible over a network.
In response to a data file to be stored in storage units 108-109, according to one embodiment, deduplication logic 107 is configured to segment the data file into multiple segments (also referred to as chunks), for example as data objects 112-113, according to a variety of segmentation policies or rules. Deduplication logic 107 may choose not to store a segment in a storage unit if the segment has been previously stored in the storage unit. In the event that deduplication logic 107 chooses not to store the segment in the storage unit, it stores metadata enabling the reconstruction of the file using the previously stored segment. As a result, segments of data files are stored in a deduplicated manner, either within each of storage units 108-109 or across at least some of storage units 108-109. The metadata, such as metadata 110-111, may be stored in at least some of storage units 108-109, such that files can be accessed independent of another storage unit. Metadata of each storage unit includes enough information to provide access to the files it contains.
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Note that some or all of the components as shown and described above (e.g., backup agent 121, restore agent 122, write latch 125, read latch 126, construction container 127 of
In one embodiment, system 1500 includes processor 1501, memory 1503, and devices 1505-1508 via a bus or an interconnect 1510. Processor 1501 may represent a single processor or multiple processors with a single processor core or multiple processor cores included therein. Processor 1501 may represent one or more general-purpose processors such as a microprocessor, a central processing unit (CPU), or the like. More particularly, processor 1501 may be a complex instruction set computing (CISC) microprocessor, reduced instruction set computing (RISC) microprocessor, very long instruction word (VLIW) microprocessor, or processor implementing other instruction sets, or processors implementing a combination of instruction sets. Processor 1501 may also be one or more special-purpose processors such as an application specific integrated circuit (ASIC), a cellular or baseband processor, a field programmable gate array (FPGA), a digital signal processor (DSP), a network processor, a graphics processor, a network processor, a communications processor, a cryptographic processor, a co-processor, an embedded processor, or any other type of logic capable of processing instructions.
Processor 1501, which may be a low power multi-core processor socket such as an ultra-low voltage processor, may act as a main processing unit and central hub for communication with the various components of the system. Such processor can be implemented as a system on chip (SoC). Processor 1501 is configured to execute instructions for performing the operations and steps discussed herein. System 1500 may further include a graphics interface that communicates with optional graphics subsystem 1504, which may include a display controller, a graphics processor, and/or a display device.
Processor 1501 may communicate with memory 1503, which in one embodiment can be implemented via multiple memory devices to provide for a given amount of system memory. Memory 1503 may include one or more volatile storage (or memory) devices such as random access memory (RAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), static RAM (SRAM), or other types of storage devices. Memory 1503 may store information including sequences of instructions that are executed by processor 1501, or any other device. For example, executable code and/or data of a variety of operating systems, device drivers, firmware (e.g., input output basic system or BIOS), and/or applications can be loaded in memory 1503 and executed by processor 1501. An operating system can be any kind of operating systems, such as, for example, Windows operating system from Microsoft®, Mac OS®/iOS® from Apple, Android® from Google®, Linux®, Unix®, or other real-time or embedded operating systems such as VxWorks.
System 1500 may further include IO devices such as devices 1505-1508, including network interface device(s) 1505, optional input device(s) 1506, and other optional 10 device(s) 1507. Network interface device 1505 may include a wireless transceiver and/or a network interface card (NIC). The wireless transceiver may be a WiFi transceiver, an infrared transceiver, a Bluetooth transceiver, a WiMax transceiver, a wireless cellular telephony transceiver, a satellite transceiver (e.g., a global positioning system (GPS) transceiver), or other radio frequency (RF) transceivers, or a combination thereof. The NIC may be an Ethernet card.
Input device(s) 1506 may include a mouse, a touch pad, a touch sensitive screen (which may be integrated with display device 1504), a pointer device such as a stylus, and/or a keyboard (e.g., physical keyboard or a virtual keyboard displayed as part of a touch sensitive screen). For example, input device 1506 may include a touch screen controller coupled to a touch screen. The touch screen and touch screen controller can, for example, detect contact and movement or break thereof using any of a plurality of touch sensitivity technologies, including but not limited to capacitive, resistive, infrared, and surface acoustic wave technologies, as well as other proximity sensor arrays or other elements for determining one or more points of contact with the touch screen.
IO devices 1507 may include an audio device. An audio device may include a speaker and/or a microphone to facilitate voice-enabled functions, such as voice recognition, voice replication, digital recording, and/or telephony functions. Other IO devices 1507 may further include universal serial bus (USB) port(s), parallel port(s), serial port(s), a printer, a network interface, a bus bridge (e.g., a PCI-PCI bridge), sensor(s) (e.g., a motion sensor such as an accelerometer, gyroscope, a magnetometer, a light sensor, compass, a proximity sensor, etc.), or a combination thereof. Devices 1507 may further include an imaging processing subsystem (e.g., a camera), which may include an optical sensor, such as a charged coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) optical sensor, utilized to facilitate camera functions, such as recording photographs and video clips. Certain sensors may be coupled to interconnect 1510 via a sensor hub (not shown), while other devices such as a keyboard or thermal sensor may be controlled by an embedded controller (not shown), dependent upon the specific configuration or design of system 1500.
To provide for persistent storage of information such as data, applications, one or more operating systems and so forth, a mass storage (not shown) may also couple to processor 1501. In various embodiments, to enable a thinner and lighter system design as well as to improve system responsiveness, this mass storage may be implemented via a solid state device (SSD). However in other embodiments, the mass storage may primarily be implemented using a hard disk drive (HDD) with a smaller amount of SSD storage to act as a SSD cache to enable non-volatile storage of context state and other such information during power down events so that a fast power up can occur on re-initiation of system activities. Also a flash device may be coupled to processor 1501, e.g., via a serial peripheral interface (SPI). This flash device may provide for non-volatile storage of system software, including a basic input/output software (BIOS) as well as other firmware of the system.
Storage device 1508 may include computer-accessible storage medium 1509 (also known as a machine-readable storage medium or a computer-readable medium) on which is stored one or more sets of instructions or software (e.g., processing module, unit, and/or logic 1528) embodying any one or more of the methodologies or functions described herein. Processing module/unit/logic 1528 may represent any of the components described above, such as, for example, modules 121-127 as described above. Processing module/unit/logic 1528 may also reside, completely or at least partially, within memory 1503 and/or within processor 1501 during execution thereof by data processing system 1500, memory 1503 and processor 1501 also constituting machine-accessible storage media. Processing module/unit/logic 1528 may further be transmitted or received over a network via network interface device 1505.
Computer-readable storage medium 1509 may also be used to store the some software functionalities described above persistently. While computer-readable storage medium 1509 is shown in an exemplary embodiment to be a single medium, the term “computer-readable storage medium” should be taken to include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) that store the one or more sets of instructions. The terms “computer-readable storage medium” shall also be taken to include any medium that is capable of storing or encoding a set of instructions for execution by the machine and that cause the machine to perform any one or more of the methodologies of the present invention. The term “computer-readable storage medium” shall accordingly be taken to include, but not be limited to, solid-state memories, and optical and magnetic media, or any other non-transitory machine-readable medium.
Processing module/unit/logic 1528, components and other features described herein can be implemented as discrete hardware components or integrated in the functionality of hardware components such as ASICS, FPGAs, DSPs or similar devices. In addition, processing module/unit/logic 1528 can be implemented as firmware or functional circuitry within hardware devices. Further, processing module/unit/logic 1528 can be implemented in any combination hardware devices and software components.
Note that while system 1500 is illustrated with various components of a data processing system, it is not intended to represent any particular architecture or manner of interconnecting the components; as such details are not germane to embodiments of the present invention. It will also be appreciated that network computers, handheld computers, mobile phones, servers, and/or other data processing systems which have fewer components or perhaps more components may also be used with embodiments of the invention.
Some portions of the preceding detailed descriptions have been presented in terms of algorithms and symbolic representations of operations on data bits within a computer memory. These algorithmic descriptions and representations are the ways used by those skilled in the data processing arts to most effectively convey the substance of their work to others skilled in the art. An algorithm is here, and generally, conceived to be a self-consistent sequence of operations leading to a desired result. The operations are those requiring physical manipulations of physical quantities.
It should be borne in mind, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated otherwise as apparent from the above discussion, it is appreciated that throughout the description, discussions utilizing terms such as those set forth in the claims below, refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical (electronic) quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system memories or registers or other such information storage, transmission or display devices.
Embodiments of the invention also relate to an apparatus for performing the operations herein. Such a computer program is stored in a non-transitory computer readable medium. A machine-readable medium includes any mechanism for storing information in a form readable by a machine (e.g., a computer). For example, a machine-readable (e.g., computer-readable) medium includes a machine (e.g., a computer) readable storage medium (e.g., read only memory (“ROM”), random access memory (“RAM”), magnetic disk storage media, optical storage media, flash memory devices).
The processes or methods depicted in the preceding figures may be performed by processing logic that comprises hardware (e.g. circuitry, dedicated logic, etc.), software (e.g., embodied on a non-transitory computer readable medium), or a combination of both. Although the processes or methods are described above in terms of some sequential operations, it should be appreciated that some of the operations described may be performed in a different order. Moreover, some operations may be performed in parallel rather than sequentially.
Embodiments of the present invention are not described with reference to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the teachings of embodiments of the invention as described herein.
In the foregoing specification, embodiments of the invention have been described with reference to specific exemplary embodiments thereof. It will be evident that various modifications may be made thereto without departing from the broader spirit and scope of the invention as set forth in the following claims. The specification and drawings are, accordingly, to be regarded in an illustrative sense rather than a restrictive sense.
Ambaljeri, Mahantesh, Reddy A V, Mahesh, Battal, Chetan, Shankar DH, Swaroop
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